Technology for Tomorrow
Solray is a solar water heating device that heats water up to 83ºC, making it drinkable and safe to cook and wash with.
Discontinued in 2012, SolRay is a solar water heater device that heats water up to 83ºC, making it drinkable, safe to cook and wash as it eliminates voltaic cells from the water. The product was by Technology for Tomorrow (t4t)’s workforce based in Kampala (Uganda) and distributed across Uganda until 2012.
1,800 USD including installation labour but excluding transport, plumbing materials and cold water reservoir.
Goal 6: Ensure access to water and sanitation for all.
Off-grid schools, organizations and communities.
Solray solar water heater device is individually manufactured by t4t in their workforce based in Kampala, Uganda.
Users can obtain this product directly from the manufacturer.
57 devices have been distributed, from which 30 are in schools in Wakiso and Luweero districts and 27 in across households in Kampala, Uganda. Interview with representative
The size of this system
The amount of water the sytem can heat per minute
Whether the circulation is passive, direct circulation, or indirect
Whether there are back-up heating sources for when there is no solar
The range of temperature of water output
The capacity if storage is included.
Design specifications include a water tank (12 depth x 250 width x 400 length mm) made from galvanized or mild steel plate with a glass sheet cover, and both the tank and glass are enclosed in a wooden box. Above the wooden box is a water reservoir or a connection to a water supply. The hot water that comes from the box can reach up to 80 ºC.Interview with representative
The water tank can be used alone or connected in series to multiple tanks.
Available from the manufacturer.Interview with representative
5 – 7 years. Over 7 years when galvanized steel is used.Interview with representative
The manufacturer found that the product needed to improve the circulation of the water through the hot reservoir and that it should be constructed with materials that don’t easily rust, such as galvanized steel metal sheets.Interview with representative
The temperature of the water was an average of 65ºC with a high of about 80ºC. The product didn’t rust for about 2-3 years.Interview with representative
There are no potential hazards reported to the use of this product. To pasteurize drinking water, the water must be heated to 55ºC. This requirement is exceeded with this device as it heats water up to 83ºC.
The production of this product has been suspended since 2012.Interview with representative
t4t commercializes sanitary pads made from papyrus and paper waste (called Makapads) and interlocking stabilized soil blocks (ISSBS), stronger and more durable than the traditional fired brick. Some case examples can be seen in the organization’s Facebook page.
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